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J. Korean Ceram. Soc. > Volume 37(1); 2000 > Article
Journal of the Korean Ceramic Society 2000;37(1): 63.
La 변성 $Pb(Sc_{1/2}Nb_{1/2})O_3-PbTiO_3$계 요업체의 전계유기변위와 분극특성
군산대학교 공과대학 재료공학과
Field-Induced Strains and Polarization Switching Mechanisms in La-Modified $Pb(Sc_{1/2}Nb_{1/2})O_3-PbTiO_3$ Ceramics
Electrically-induced strain(S) and polarization(P) for Pb(Sc1/2Nb1/2)O3-PbTiO3(1-x)PSN-xPT) crystalline solutions were studied. From the compositional dependence of S and P we could observe two maximum values at x=0.10 and x=0.425. It is considered that PSNT10(x=0.10) composition is the structural phase boundary to indicate the variable order-disorder[VOD] region. PSNT(x=0.425) composition is the morphotropic phase boundary[MPB] to indicate the rhombohedral to tetragonal phase transition. Higher S (0.437%) and P (0.3974$mu$C/$textrm{cm}^2$) values were attained by the La substitution (5 wt%) at Pb site in the MPB composition of 57.5PSN-42.5PT.
Key words: Relaxor, Strain, Polarization, PSN, PT
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